144 DISEASES OF DOMESTICATED BIRDS 
cumbed. This bird before inoculation was observed to be highly 
emaciated and anemic. Two geese receiving subcutaneous injections 
of 4 c.c. resisted infection. Of 16 pigeons inoculated, 7 contracted 
anthrax. Other birds such as ducks, sparrows, canaries, jays, hawks 
and crows, were very susceptible to inoculation. That writer makes 
a distinction between susceptibility to anthrax by inoculation, and 
susceptibility to the natural spontaneous infection. He knows of no 
instance of the latter. 
Mollhoff concludes that the resistance of the hen to anthrax con- 
sists of action of the body fluids or lymph by virtue of strongly 
bactericidal materials contained in them. The anthrax bacilli in 
the subcutaneous tissues are killed in a short time by the bacteri- 
cidal action of the lymph, so that no local development nor general 
infection can occur. 
The origin of this bactericidal material of the lymph, especially 
with reference to whether or not it originated in the leucocytes, 
could not be determined. Phagocytosis is not of decisive importance 
in connection with the destruction of anthrax infection in the hen. 
The resistance of hens against anthrax does not depend upon their 
high body temperature. 
Anthrax occurs in the ostrich as a common natural infection 
and is discussed in Chapter XVIII. 
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